var express=require('express');
var app =express();

//设置跨域访问
app.all('*', function(req, res, next) {
   res.header("Access-Control-Allow-Origin", "*");
   res.setHeader("Access-Control-Allow-Origin","*");
   res.header("Access-Control-Allow-Headers", "X-Requested-With");
   res.header("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");
   res.header("X-Powered-By",' 3.2.1');
   res.header("Content-Type", "application/json;charset=utf-8");
   next();
});



var questions=[
{
data:213,
num:444,
age:12
},
{
    data:456,
    num:678,
    age:13
    }];

    //写个接口123
    app.get('/appData',function(req,res){
    res.status(200),
    res.json(questions)
    });

    //配置服务端口
    var server = app.listen(3000, function () {

    var host = server.address().address;

     var port = server.address().port;

        console.log('Example app listening at http://%s:%s', host, port);
    })